Hack of C++ compiler

int *func()
{
    //return nullptr;
    return new int(3);
}

int main()
{
    int *pi = func();

    if (pi)
        goto ok;

    goto fail;

ok:
    int &tt = *pi;

fail:
    tt = 20;

    if (pi)
        delete pi;

    _getch();
    return 0;
}